[W(CO)5]-Catalyzedendo- orexo-Cycloisomerization Reactions of 1,1-Disubstituted 4-Pentyn-1-ols: Experimental and Theoretical Studies
作者:José Barluenga、Alejandro Diéguez、Félix Rodríguez、Francisco J. Fañanás、Tomás Sordo、Pablo Campomanes
DOI:10.1002/chem.200500537
日期:2005.9.19
The [W(CO)5]-catalyzed cycloisomerization reaction of 1,1-disubstituted 4-pentyn-1-ol derivatives has been studied from both, an experimental and theoretical point of view. Three different catalytic systems have been evaluated preformed [(thf)W(CO)5], [W(CO)6]/excess Et3N, and [W(CO)6]/2 mol % Et3N]. We have found that the reaction proceeds to give the formal endo- or exo-cycloisomerization products
从实验和理论的角度研究了[W(CO)5]催化的1,1-二取代的4-戊炔-1-醇衍生物的环异构化反应。已经评估了三种不同的催化体系预制的[(thf)W(CO)5],[W(CO)6] /过量的Et3N和[W(CO)6] / 2 mol%Et3N]。我们已经发现,根据所用的Et 3 N的量和沿起始炔醇的烷基链的取代,反应进行以给出正式的内-或外-环异构化产物。理论研究使我们能够找到反应的机理,这些反应解释了形式的内-或外-环异构化产物的形成。